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Related Questions:

run the fault codes to check for TCM or other problem sensor in the transmission. It may be a protection item as it is unwise to kick down at that speed as kickdowns are used to change to lower gears when going up hill or pulling a load and need a lower gear . They are not meant to pass at speed .It is the same effect bas with a manual in overdrive at 100klms and suddenly shifting into 1st gear

Still think ot vacuum related .This will push the revs up sky high .Get a good cigar and pulloff a vacum pipe .Take a good puff on the cigar now puff the emoke down the vaccum pipe .Now do you know what your looking for .You got it ,,, smoke ,,,,than you have found the leak.Thats if you have one ..Can you get a obd check it will tell you what it is ..Thermostat removal wont change the engine revs

Is there somthing hitting the gas pedal, like the floor mat? Or maybe something under the dash came loose and is getting caught under the brake pedal and pushing on the gas. Put the shifter in neutral if you get into a situation where going to hit something or someone. The engine has a rev limiter, to prevent it from over reving.

Make sure that a floor mat or something is not blocking the foot pedal travel. Check at the engine for any reason that limits throttle travel. If all ok, then check the air intake filter and the exhaust system for blockage. Does the engine miss badly when trying to accelerate?

White smoke is a sign of unburnt diesel fuel, check your glowplugs as thats the most common cause when starting .It will start but not hot enough to burn fuel at start up, also check glowplug relay if not the plugs
Delica Owner 4m40

sounds like one of two things first is to check condition of all drive belts if they are all good dont let the miles fool you if the car has been driven a bit harder or had alot of uphill driving these reduce clutch wear enormously